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Time.h
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Time.h
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/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <stdint.h>
#include <time.h>
#include <folly/portability/Config.h>
// OSX is a pain. The XCode 8 SDK always declares clock_gettime
// even if the target OS version doesn't support it, so you get
// an error at runtime because it can't resolve the symbol. We
// solve that by pretending we have it here in the header and
// then enable our implementation on the source side so that
// gets linked in instead.
#if defined(__MACH__) && defined(__CLOCK_AVAILABILITY)
#ifdef FOLLY_HAVE_CLOCK_GETTIME
#undef FOLLY_HAVE_CLOCK_GETTIME
#endif
#define FOLLY_HAVE_CLOCK_GETTIME 1
#define FOLLY_FORCE_CLOCK_GETTIME_DEFINITION 1
#else
#define FOLLY_FORCE_CLOCK_GETTIME_DEFINITION 0
#endif
// These aren't generic implementations, so we can only declare them on
// platforms we support.
#if !FOLLY_HAVE_CLOCK_GETTIME && (defined(__MACH__) || defined(_WIN32))
#define CLOCK_REALTIME 0
#define CLOCK_MONOTONIC 1
#define CLOCK_PROCESS_CPUTIME_ID 2
#define CLOCK_THREAD_CPUTIME_ID 3
typedef uint8_t clockid_t;
extern "C" int clock_gettime(clockid_t clk_id, struct timespec* ts);
extern "C" int clock_getres(clockid_t clk_id, struct timespec* ts);
#endif
#ifdef _WIN32
#define TM_YEAR_BASE (1900)
extern "C" {
char* asctime_r(const tm* tm, char* buf);
char* ctime_r(const time_t* t, char* buf);
tm* gmtime_r(const time_t* t, tm* res);
tm* localtime_r(const time_t* t, tm* o);
int nanosleep(const struct timespec* request, struct timespec* remain);
char* strptime(
const char* __restrict buf,
const char* __restrict fmt,
struct tm* __restrict tm);
time_t timelocal(tm* tm);
time_t timegm(tm* tm);
}
#endif